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Control of roof and prevention of accidents from falls of rock and coal :suggested roof supports for use at faces in conjunction with mechanical loading

Published Year

• 1940-1949 (1) *

Subject

• Coal mines and mining--Safety measures (1)
• Tunneling--Equipment and supplies (1)

Author

• Hansen, M.V. (1)
• Perz, Frank. (1) *
• Seeling, C.H. (1)
• Thomas, Edward. (1)

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